Is my text uploaded to a server?

No. Encoding and decoding run entirely in your browser using its built-in functions. Your input never leaves your device, which matters because Base64 often wraps tokens or private data.

Does it handle emoji and non-English text?

Yes. Text is processed as UTF-8, so emoji, accented characters, and non-Latin scripts encode and decode correctly instead of turning into garbled output.

Is Base64 a form of encryption?

No. Base64 is a reversible encoding that anyone can decode. It makes binary data safe to represent as text — it does not secure or hide it.

Why does my Base64 fail to decode?

The most common causes are missing padding characters (=), an unexpected character in the string, or a URL-safe variant. This tool tolerates whitespace and URL-safe input, so paste the full value and it should decode.

Can I encode a file to Base64?

This tool focuses on text. For encoding, paste the text you want to convert; file-to-Base64 support may be added later.

Is there a size limit?

There's no fixed limit — because it runs in your browser, you can encode or decode as much text as your device's memory allows.

Free Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 back to plain text, instantly in your browser. UTF-8 safe and completely private — nothing is uploaded.

Plain text

Base64

Encoding and decoding run entirely in your browser — nothing is uploaded.

How to Encode and Decode Base64 in Your Browser

Pick encode or decode

Choose Encode to turn text into Base64, or Decode to turn Base64 back into readable text.

Type or paste your input

The result updates live as you type. Input is handled as UTF-8, so emoji and accented characters round-trip correctly.

Copy the result

Copy the output to your clipboard with one click, or hit Swap to feed it back through for a quick round-trip check.

Everything You Need to Work With Base64

A good Base64 tool handles Unicode correctly, updates instantly, and never phones home. Here's how this one does each.

UTF-8 safe

Text is encoded as UTF-8 before Base64, so emoji, accents, and non-Latin scripts encode and decode without corruption — a common failure of naive tools.

Instant, two-way

Encode and decode from one screen, with a Swap button to send the output back through the other direction for verification.

Tolerant decoding

Decoding ignores whitespace and line breaks and accepts URL-safe Base64, so pasted values just work.

Private by design

Everything runs in your browser. Since Base64 often wraps tokens, keys, or payloads, keeping it local means none of that is ever uploaded.

When a Base64 Tool Helps

Base64 shows up all over development. These are the moments you reach for an encoder or decoder.

Inspect a JWT or token

Decode the Base64 segments of a token or header to read what's inside without pulling in a library.

Embed data inline

Encode a small snippet of text or a data string to drop into a data URI, config value, or query parameter.

Read an encoded payload

Decode a Base64 blob from an API response, log line, or email header to see the plain text it represents.

Debug encoding issues

Round-trip a string through encode and decode to confirm your own code is handling Base64 and UTF-8 correctly.

Decode Base64 Without Sending It to a Server

Many online Base64 tools post your input to a server to process it. Since Base64 frequently carries credentials or private payloads, doing it locally is the safer choice.

In-browser with SupaTools

Your text is encoded and decoded on your device, never uploaded
Correct UTF-8 handling for any language or emoji
Encode, decode, and swap in one place
Free with no sign-up and no size limit

Typical online converters

Your input — tokens and all — sent to their server
Unclear how long the data is logged or retained
Some mangle Unicode or reject URL-safe Base64
Ads or rate limits on larger inputs

Pro Tips for Base64

Base64 is not encryption

It's an encoding, not a cipher — anyone can decode it. Never rely on Base64 to protect secrets; it only makes binary data safe to transport as text.

Watch for URL-safe variants

URL-safe Base64 swaps + and / for - and _. This tool accepts both, but other systems may need the exact variant they expect.

Padding matters

Standard Base64 pads its length with = characters. If a value fails to decode elsewhere, missing padding is a frequent cause.

Base64 — Frequently Asked Questions

Encode or Decode Base64 Free — No Sign-Up

Paste your text or Base64 above and see the result instantly. Nothing is uploaded — it all runs in your browser.